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3
Pre-Installation and Boiler Mounting
d. Position the upper boiler on top of the
bottom boiler and align boiler front doors
and sides flush with each other.
•
Place first stacking boiler attachment
bracket onto the upper boiler left side
panel, at the panel lower left corner
and align bracket two upper holes
with corresponding side panel lower
dimples.
•
The remaining lower bracket hole must
align with a matching bottom boiler left
side panel top positioning dimple.
•
Once bracket holes and side panel
dimple alignment is verified, attach the
bracket to top and bottom boiler left
side panels with the mounting screws.
e. Repeat above procedure to install second
stacking boiler attachment bracket and
secure the stacked boiler right side panels
together at the front right corner.
f. Install the third stacking boiler attachment
bracket to secure top and bottom boiler
left side panels at the rear left corner. Align
the bracket holes with corresponding
positioning dimples in the top boiler and
bottom boiler left side panels, then secure
bracket with the screws.
g. Repeat above procedure to install the
fourth stacking boiler attachment bracket to
secure stacked boiler right side panels at
the rear right corner.
3. Tilt top boiler display downward as shown in
Figure 3-5.
a. Remove screws attaching display panel to
boiler left and right side panels (two screws
per side).
b. On back side of display panel, disconnect
three electrical connectors display, detach
two strain relief cable screws from top of
panel, and loosen two display mounting
screws.
c. Remove display, rotate panel 180° relative
to display, reinstall display, and tighten
display mounting screws. Interchange left
and right display panel end caps.
d. On back side of display panel, attach strain
relief cable screws and reconnect three
electrical connectors.
e. Attach downward-tilted panel to top boiler.
4. When installing stackable boiler combinations
observe the following guidelines:
12
APEX
Installation, Operating, & Service Instructions
(continued)
a. Venting - Top and bottom boilers must
have their individual vent piping and vent
terminals.
!
Asphyxiation Hazard.
No common manifold venting is permitted. Each
boiler must have its own individual vent and
combustion air pipes and terminals.
For sidewall venting individual model vent
terminals must terminate no closer than 12
in. (300 mm) horizontally and 3 ft. (900 mm)
vertically from each other in order to prevent
combustion air contamination. For vertical
through the roof venting, individual vertical
vent terminals, if level with each other, must
be spaced no closer than 12 in. (300 mm)
horizontally. If vertical terminals cannot
end in one plane, they must be spaced no
closer than 3 ft. (900 mm) horizontally.
Follow instructions in Section 4 "Venting"
of the manual for specifics of individual
boiler vent termination. Follow instructions
in Section 5 "Condensate Disposal" for
each individual boiler flue gas condensate
line construction and condensate disposal.
Terminating individual boiler condensate
lines into common pipe prior to drain
disposal is permissible, providing common
pipe has sufficient flow capacity to handle
combined condensate volume of stackable
combination.
b. Gas Piping - Follow instructions in Section
7 "Gas Piping" of the manual for sizing and
installation of an individual boiler. When
common gas piping is sized, ensure it will
have adequate capacity for combined input
(CFH gas flow) of the selected stackable
boiler combination.
c. Water Piping and Trim - Follow instructions
in Section 6 "Water Piping and Trim" of
the manual for system piping and boiler
secondary piping selection/sizing based
on combined heating capacity and/or
gross output of the selected stackable
boiler combination. Follow instructions of
Section 6 "Water Piping and Trim" for each
individual boiler trim installation.
d. Electrical - Follow instructions in Section 8
"Electrical" of the manual to wire individual
boilers.
WARNING
106308-05 - 3/23
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